It's been a month since Yukino started dating Tomonari, but she still can't bring herself to stay the night. Although she acts like a capable woman, she is still suffering from the trauma of her first boyfriend and is still losing her virginity... Then, on Yukino's birthday, he proposes an overnight trip to a hot spring. She can't refuse and stays the night, but she ends up rejecting him... 4th It is included in the "season"